Caterpillar original Fuel Injector 321-3600 Diesel Nozzle for C4.4 C6.6 C6.4 1106D-E66TA Engine D6K D6N Tractor 953D Loader R1300G E320D 323D 326-4700 10R7938 original new injector

The CAT 321-3600 fuel injector is engineered as an OEM original replacement component for Caterpillar C6, C6.4, and C6.6 diesel engines, delivering precision fuel metering across every combustion cycle. Designed for high-pressure common rail fuel systems, it ensures accurate injection timing and dosage, which directly contributes to optimized engine performance, improved fuel efficiency, and reduced exhaust emissions. The injector also serves as a cross reference for 10R-7938, 2645A753, and 320-3800, offering broad compatibility across the C6 engine platform.

Constructed from hardened alloy steel with precision-ground internal components, the 321-3600 injector assembly is built for long service life in demanding operating conditions. Enhanced fuel atomization technology produces finer fuel particles for cleaner and more complete combustion, while protective surface coatings deliver strong corrosion resistance in harsh environments. Each unit undergoes strict OEM standard calibration, including flow rate verification and spray pattern inspection, supporting reliable cold starts, stable idle quality, and consistent power output under heavy load.

This CAT common rail injector is widely applied across construction, mining, agriculture, power generation, and marine industries, fitting equipment such as 312D, 320D, and 323D excavators, 924H and 928HZ wheel loaders, D6K dozers, AP600D pavers, 953D, forestry machinery, and C6-powered diesel generator sets. It also helps engines meet Tier III and regional low emission requirements, making it a dependable solution for equipment operators and maintenance professionals who require durable, emission-compliant fuel injection performance.